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Tritium Analysis of Divertor Tiles Used in JET ITER-like Wall Campaigns by Means of β-ray Induced X-ray Spectrometry
https://repo.qst.go.jp/records/72772
https://repo.qst.go.jp/records/7277217bf9f7c-d32f-4175-809f-70f1c999d847
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-05-02 | |||||
| タイトル | ||||||
| タイトル | Tritium Analysis of Divertor Tiles Used in JET ITER-like Wall Campaigns by Means of β-ray Induced X-ray Spectrometry | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Hatanoa, Y.
× Hatanoa, Y.× Yumizurua, K.× Masuzaki, S.× Tokitani, M.× Asakura, Nobuyuki× Isobe, Kanetsugu× Hayashi, Takumi× Koivuranta, S.× Likonen, J.× Matsuyama, M.× Baron-Wiechec, A.× Widdowson, A.× Heinola, K.× Jachmich, S.× Rubel, M.× contributors, JET× 朝倉 伸幸× 磯部 兼嗣× 林 巧 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Tritium (T) distributions in divertor tiles retrieved from the JET-ITER Like Wall (ILW) after the 1st (2011–2012) and 2nd (2013–2014) experimental campaigns were examined by measuring energy spectra of X-rays induced by β-rays from T. Disk specimens cored from the W-coated CFC divertor tiles (Tiles 1, 4, 6, 7 and 8) were analysed using a silicon-drift detector (SDD) equipped with an ultra-thin window (70 nm-thick Si3N4) at QST, Rokkasho. Analysis using a SDD with a conventional window (8 μm-thick Be) was performed at VTT. The former SDD was used to detect characteristic X-rays of Be together with those of W, while the latter was more suitable for non-destructive depth profiling by analysing X-ray energy spectra. A majority of T currently present in the JET vacuum vessel is produced by DD fusion reactions [D + D → T (1.01 MeV) + H (3.03 MeV)]. Therefore, T is present as a minor isotope of hydrogen in the vessel. A part of T produced is implanted into the tiles at high energy (~MeV), while a remaining part of T is thermalized in the plasma. Strong peaks of Be KαX-rays were observed for the horizontal and upper vertical parts of Tile 1 due to heavy co-deposition of T with Be eroded from the main chamber wall. Intensity of Be KαX-rays was below detection limit for other tiles because of far smaller thickness or absence of Be deposition layer. In contrast, the intensity of W MαX-rays was almost uniform though it was somewhat high at the positions close to the main plasma (the horizontal parts of Tiles 1 and 8). Depth profile analyses showed that T penetrated into depths up to 0.5–4 μm. These observations indicated the implantation of high energy T into the W layers. Exceptionally high intensity of X-rays (and also γ-rays) was observed at the shadowed region of Tile 4, though thermal desorption spectrometry showed relatively small D retention in this region. The mechanisms underlying this exceptional T accumulation will be discussed in the presentation by taking account of the results of microstructural analysis. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 16th International Conference on Plasma-Facing Materials and Components for Fusion Applications (PFMC-16) | |||||
| 発表年月日 | ||||||
| 日付 | 2017-05-16 | |||||
| 日付タイプ | Issued | |||||
